Hubble's Law
The linear relationship between the distance of a galaxy from the observer and its motion away from the observer, resulting from the expansion of the universe.
(Webster's New World College Dictionary)
 

V = HoD

where V is the observed velocity of the galaxy
away from us. (km/sec)
H is the Hubble Constant (km/sec/Mpc)
D is the distance to the galaxy (Mpc)
(Cornell)

The value of H is uncertain, however,
at the present time it is thought to be
between 45-90 km/sec/Mpc
 (Cornell) 

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